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OpenStudy (anonymous):
A rock is thrown vertically upward with a speed of 15.0 {\rm m/s} from the roof of a building that is 70.0 {\rm m} above the ground. Assume free fall.
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OpenStudy (anonymous):
In how many seconds after being thrown does the rock strike the ground?
OpenStudy (anonymous):
x-x_0=v_0t+0.5at^2, with x being 0, x_0 being 70, v_0 being 15, a being -9.8. Use the quadratic equation to solve.
OpenStudy (anonymous):
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